perf(macOS): scope workbench refresh and add FPS monitor

Sources/Lithe/LitheApp.swift

@@ -60,6 +60,7 @@ struct LitheApp: App {
     @StateObject private var settings: AppSettings
     @StateObject private var projectSessions: ProjectSessionManager
     @StateObject private var memoryUsageMonitor: MemoryUsageMonitor
+    @StateObject private var frameRateMonitor = FrameRateMonitor()
     @StateObject private var updateChecker = UpdateChecker()
 
     init() {
@@ -122,6 +123,7 @@ struct LitheApp: App {
                 .environmentObject(projectSessions)
                 .environmentObject(settings)
                 .environmentObject(memoryUsageMonitor)
+                .environmentObject(frameRateMonitor)
                 .environmentObject(updateChecker)
                 .environment(\.locale, settings.language.locale)
                 // SwiftUI does not consistently re-resolve every existing
@@ -132,6 +134,7 @@ struct LitheApp: App {
                 .preferredColorScheme(settings.themePreference.preferredColorScheme)
                 .task {
                     memoryUsageMonitor.start()
+                    frameRateMonitor.start()
                 }
         }
         .defaultSize(

Sources/Lithe/Models/AppModel/AppModel+EditorIntelligence.swift

@@ -1,6 +1,30 @@
 import Foundation
 
+struct LanguageSessionChromeSignature: Equatable {
+    var features: [String: LanguageServerFeatureSet]
+    var states: [String: LanguageServerSessionState]
+    var infos: [String: LanguageServerInfo]
+}
+
 extension AppModel {
+    func handleLanguageSessionChange() {
+        refreshEditorDiagnosticsStore()
+        let signature = LanguageSessionChromeSignature(
+            features: languageToolingSessionsIfActive?.languageServerFeatures ?? [:],
+            states: languageToolingSessionsIfActive?.languageServerStates ?? [:],
+            infos: languageToolingSessionsIfActive?.languageServerInfos ?? [:]
+        )
+        guard signature != languageSessionChromeSignature else { return }
+        languageSessionChromeSignature = signature
+        scheduleObjectWillChangeRelay()
+    }
+
+    func refreshEditorDiagnosticsStore() {
+        editorDiagnosticsStore.replace(
+            EditorDiagnostic.fromLanguageServerDiagnostics(languageDiagnostics)
+        )
+    }
+
     func refreshCodeVision(for fileURL: URL) async {
         let normalizedURL = fileURL.standardizedFileURL
         guard normalizedURL.pathExtension.lowercased() == "java",

Sources/Lithe/Models/AppModel/AppModel+FeatureState.swift

@@ -49,16 +49,19 @@ extension AppModel {
     var isPendingProjectClose: Bool { documentFeature.isPendingProjectClose }
 
     var gitChanges: [GitChange] { gitFeatureIfActive?.gitChanges ?? [] }
+    var gitTreeStatusProjection: GitTreeStatusProjection {
+        gitFeatureIfActive?.gitTreeStatus ?? GitTreeStatusProjection(changes: [])
+    }
     func gitChange(for url: URL) -> GitChange? {
         guard let root = gitRepositoryRoot,
               let relativePath = workspaceRelativePath(for: url, root: root) else { return nil }
-        return GitTreeStatusProjection(changes: gitChanges).change(relativePath: relativePath)
+        return gitFeatureIfActive?.gitTreeStatus.change(relativePath: relativePath)
     }
 
     func gitTreeStatus(for url: URL, isDirectory: Bool) -> GitChangeKind? {
         guard let root = gitRepositoryRoot,
               let relativePath = workspaceRelativePath(for: url, root: root) else { return nil }
-        return GitTreeStatusProjection(changes: gitChanges).kind(
+        return gitFeatureIfActive?.gitTreeStatus.kind(
             relativePath: relativePath,
             isDirectory: isDirectory
         )

Sources/Lithe/Models/AppModel/AppModel.swift

@@ -68,14 +68,25 @@ final class AppModel: ObservableObject, Identifiable {
     /// Replace in Project 面板的搜索选项（Preserve Case、文件掩码等）。
     @Published var projectReplaceOptions = ProjectSearchOptions.default
     @Published var selectedProjectReplacementPaths: Set<String> = []
+    let editorChrome = EditorChromeModel()
+    let editorDiagnosticsStore = EditorDiagnosticsStore()
     /// 编辑器当前选中的单行文本，供 Find/Replace in Files 预填查询词。
-    @Published var editorSelectedText = ""
+    var editorSelectedText: String {
+        get { editorChrome.selectedText }
+        set { editorChrome.update(selectedText: newValue) }
+    }
     /// 递增令牌：搜索侧栏观察它来把焦点移回输入框。
     @Published var searchSidebarFocusRequest = 0
-    @Published var isFindBarVisible = false
-    @Published var findBarQuery = ""
-    @Published private(set) var findMatchCount = 0
-    @Published private(set) var currentFindMatchIndex = 0
+    var isFindBarVisible: Bool {
+        get { editorChrome.isFindBarVisible }
+        set { editorChrome.setFindBarVisible(newValue) }
+    }
+    var findBarQuery: String {
+        get { editorChrome.findBarQuery }
+        set { editorChrome.setFindBarQuery(newValue) }
+    }
+    var findMatchCount: Int { editorChrome.findMatchCount }
+    var currentFindMatchIndex: Int { editorChrome.currentFindMatchIndex }
     var projectItemEditRequest: ProjectItemEditRequest? {
         get { workspaceFeature.projectItemEditRequest }
         set { workspaceFeature.projectItemEditRequest = newValue }
@@ -108,7 +119,10 @@ final class AppModel: ObservableObject, Identifiable {
     @Published var languageNavigationLocations: [LanguageNavigationLocation] = []
     @Published var languageNavigationResultKind: LanguageNavigationResultKind = .definitions
     @Published var isLoadingLanguageNavigation = false
-    @Published var editorCaret: EditorCaret?
+    var editorCaret: EditorCaret? {
+        get { editorChrome.caret }
+        set { editorChrome.update(caret: newValue) }
+    }
     @Published var editorNavigationTarget: EditorNavigationTarget?
     let navigationHistoryFeature: NavigationHistoryFeatureModel
     var virtualDocumentProviderIDs: [URL: String] = [:]
@@ -244,8 +258,9 @@ final class AppModel: ObservableObject, Identifiable {
         return combined
     }
     var editorDiagnostics: [URL: [EditorDiagnostic]] {
-        EditorDiagnostic.fromLanguageServerDiagnostics(languageDiagnostics)
+        editorDiagnosticsStore.diagnosticsByURL
     }
+    var languageSessionChromeSignature: LanguageSessionChromeSignature?
     private var workspaceFeatureObservation: AnyCancellable?
     private var githubFeatureObservation: AnyCancellable?
     private var runtimeFeatureObservation: AnyCancellable?
@@ -623,6 +638,7 @@ final class AppModel: ObservableObject, Identifiable {
             self?.scheduleObjectWillChangeRelay()
         }
         springFeatureObservation = springFeature.objectWillChange.sink { [weak self] _ in
+            self?.refreshEditorDiagnosticsStore()
             self?.scheduleObjectWillChangeRelay()
         }
         fileVisibilityRulesObserverID = settings.addFileVisibilityRulesObserver { [weak self] in
@@ -959,7 +975,8 @@ final class AppModel: ObservableObject, Identifiable {
         isRunVisible = false
         isTestsVisible = false
         isDebugVisible = false
-        editorCaret = nil
+        editorChrome.reset()
+        editorDiagnosticsStore.reset()
         editorNavigationTarget = nil
         navigationHistoryFeature.reset()
         virtualDocumentProviderIDs.removeAll()
@@ -1022,10 +1039,8 @@ final class AppModel: ObservableObject, Identifiable {
         projectReplaceQuery = ""
         projectReplaceText = ""
         selectedProjectReplacementPaths = []
-        isFindBarVisible = false
-        findBarQuery = ""
-        findMatchCount = 0
-        currentFindMatchIndex = 0
+        editorChrome.resetFindBar()
+        editorDiagnosticsStore.reset()
         projectHistoryFeatureIfActive?.reset()
         workspaceFeature.reset()
         gitFeatureIfActive?.reset()
@@ -1048,7 +1063,7 @@ final class AppModel: ObservableObject, Identifiable {
         genericDebugFeatureIfActive?.reset()
         javaFeature.stop()
         springFeature.reset()
-        editorCaret = nil
+        editorChrome.reset()
         editorNavigationTarget = nil
         navigationHistoryFeature.reset()
         virtualDocumentProviderIDs.removeAll()
@@ -1338,7 +1353,7 @@ final class AppModel: ObservableObject, Identifiable {
                     guard let capability = value as? LitheLanguageIntelligenceModule.LanguageIntelligenceCapability else { return }
                     self.cacheModuleCapability(capability, id: .languageIntelligence, moduleID: .languageIntelligence)
                     self.observeModuleFeature(.languageIntelligence, observation: capability.sessions.objectWillChange.sink { [weak self] _ in
-                        self?.scheduleObjectWillChangeRelay()
+                        self?.handleLanguageSessionChange()
                     })
                     capability.tools.onCandidatesChanged = { [weak self] providerID in
                         guard let self,
@@ -1391,14 +1406,11 @@ final class AppModel: ObservableObject, Identifiable {
 
     func showFindBar() {
         guard activeDocument != nil else { return }
-        isFindBarVisible = true
+        editorChrome.setFindBarVisible(true)
     }
 
     func hideFindBar() {
-        isFindBarVisible = false
-        findBarQuery = ""
-        findMatchCount = 0
-        currentFindMatchIndex = 0
+        editorChrome.resetFindBar()
         NotificationCenter.default.post(name: .litheFindDismiss, object: nil)
     }
 
@@ -1411,7 +1423,7 @@ final class AppModel: ObservableObject, Identifiable {
     }
 
     func setFindBarQuery(_ query: String) {
-        findBarQuery = query
+        editorChrome.setFindBarQuery(query)
         NotificationCenter.default.post(
             name: .litheFindQueryChanged,
             object: nil,
@@ -1428,9 +1440,7 @@ final class AppModel: ObservableObject, Identifiable {
     }
 
     func updateFindState(currentIndex: Int, count: Int) {
-        guard currentFindMatchIndex != currentIndex || findMatchCount != count else { return }
-        findMatchCount = count
-        currentFindMatchIndex = currentIndex
+        editorChrome.updateFindState(currentIndex: currentIndex, count: count)
     }
 
     func commitStagedChanges() async {

Sources/Lithe/Models/Editor/EditorChromeModel.swift

@@ -0,0 +1,54 @@
+import Combine
+import Foundation
+
+/// Caret, selection, and Find in File chrome. These values change on arrow
+/// keys and query keystrokes, so they live off `AppModel` and must not
+/// republish the workbench tree.
+@MainActor
+final class EditorChromeModel: ObservableObject {
+    @Published private(set) var caret: EditorCaret?
+    @Published private(set) var selectedText = ""
+    @Published private(set) var isFindBarVisible = false
+    @Published private(set) var findBarQuery = ""
+    private(set) var findMatchCount = 0
+    private(set) var currentFindMatchIndex = 0
+
+    func update(caret: EditorCaret?) {
+        guard self.caret != caret else { return }
+        self.caret = caret
+    }
+
+    func update(selectedText: String) {
+        guard self.selectedText != selectedText else { return }
+        self.selectedText = selectedText
+    }
+
+    func setFindBarVisible(_ isVisible: Bool) {
+        guard isFindBarVisible != isVisible else { return }
+        isFindBarVisible = isVisible
+    }
+
+    func setFindBarQuery(_ query: String) {
+        guard findBarQuery != query else { return }
+        findBarQuery = query
+    }
+
+    func updateFindState(currentIndex: Int, count: Int) {
+        guard currentFindMatchIndex != currentIndex || findMatchCount != count else { return }
+        objectWillChange.send()
+        currentFindMatchIndex = currentIndex
+        findMatchCount = count
+    }
+
+    func resetFindBar() {
+        setFindBarVisible(false)
+        setFindBarQuery("")
+        updateFindState(currentIndex: 0, count: 0)
+    }
+
+    func reset() {
+        update(caret: nil)
+        update(selectedText: "")
+        resetFindBar()
+    }
+}

Sources/Lithe/Models/Editor/EditorDiagnosticsStore.swift

@@ -0,0 +1,22 @@
+import Combine
+import Foundation
+
+/// Latest editor diagnostics for the open workspace. Language-server publish
+/// storms stay on this object so the workbench tree does not rebuild.
+@MainActor
+final class EditorDiagnosticsStore: ObservableObject {
+    @Published private(set) var diagnosticsByURL: [URL: [EditorDiagnostic]] = [:]
+
+    func replace(_ diagnostics: [URL: [EditorDiagnostic]]) {
+        guard diagnosticsByURL != diagnostics else { return }
+        diagnosticsByURL = diagnostics
+    }
+
+    func reset() {
+        replace([:])
+    }
+
+    func diagnostics(for url: URL) -> [EditorDiagnostic] {
+        diagnosticsByURL[url.standardizedFileURL] ?? []
+    }
+}

Sources/Lithe/Models/Editor/EditorDocument.swift

@@ -17,7 +17,11 @@ final class EditorDocument: ObservableObject, Identifiable, @unchecked Sendable
     private(set) var url: URL
     let isReadOnly: Bool
     let displayPath: String?
-    @Published var text: String
+    private var storedText: String
+    var text: String {
+        get { storedText }
+        set { replaceText(newValue, publish: true) }
+    }
     @Published private(set) var savedText: String
     @Published var hasExternalConflict = false
     private(set) var lastKnownModificationDate: Date?
@@ -32,7 +36,7 @@ final class EditorDocument: ObservableObject, Identifiable, @unchecked Sendable
         self.url = url
         self.isReadOnly = isReadOnly
         self.displayPath = displayPath
-        self.text = text
+        self.storedText = text
         self.savedText = text
         self.lastKnownModificationDate = modificationDate
     }
@@ -41,7 +45,22 @@ final class EditorDocument: ObservableObject, Identifiable, @unchecked Sendable
         displayPath?.split(separator: "/").last.map(String.init) ?? url.lastPathComponent
     }
 
-    var isDirty: Bool { text != savedText }
+    var isDirty: Bool { storedText != savedText }
+
+    /// Keep the live NSTextView buffer in sync without waking SwiftUI on every
+    /// already-dirty keystroke. The first edit still publishes so the tab dirty
+    /// mark can appear.
+    func applyLiveEditorText(_ newText: String) {
+        replaceText(newText, publish: isDirty != (newText != savedText))
+    }
+
+    private func replaceText(_ newText: String, publish: Bool) {
+        guard storedText != newText else { return }
+        if publish {
+            objectWillChange.send()
+        }
+        storedText = newText
+    }
 
     func save() throws {
         guard !isReadOnly else { throw DocumentError.readOnly }

Sources/Lithe/Models/Workspace/ProjectSessionManager.swift

@@ -185,9 +185,14 @@ final class ProjectSessionManager: ObservableObject {
                 self.removeClosedSession(model)
             }
         )
-        modelObservations[model.id] = model.objectWillChange.sink { [weak self] _ in
-            self?.objectWillChange.send()
-        }
+        // Only workspace open/close should wake the window chrome. Relaying
+        // every AppModel tick rebuilds every mounted project session.
+        modelObservations[model.id] = model.$workspaceURL
+            .removeDuplicates()
+            .dropFirst()
+            .sink { [weak self] _ in
+                self?.objectWillChange.send()
+            }
     }
 
     private func removeClosedSession(_ model: AppModel) {